I didn’t really care, but I know people who would curl into fetal position from just thought of it.
Not sure about curling up, but Velcro strips on the head are problematic if you want to use a StoFen occasionally, or Canon's gel holder for the 600EX-RT.
My StoFen (also generic) fits over the Velcro no problem; YMMV. I can see it interfering with the 600ex gel holder, but if I had a gel holder I wouldn't need the Velcro.
Not saying it's a solution for everybody, but when I did it I wonder why I didn't do it much, much sooner.